A new chemical form of essential oil of Hyssopus officinalis L. (Lamiaceae) from Nigeria

Essential oil obtained by hydrodistillation from the air-dried leaves of Hyssopus officinalis L. (Lamiaceae) collected in Ajangbadi area, West of Lagos, Nigeria, was analyzed comprehensively for its constituents by means of gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The monoterpene hydrocarbons, á-pinene (70.9%) and â-pinene (10.9%) are the dominant constituents of the oil of H. officinalis. A cluster analysis was performed for comparison and characterization of H. officinalis essential oil from Nigeria with other oils reported in the literature from different locations across the world, and reveals chemical variation in this species with at least 8 different chemotypes. The compositional pattern of Nigerian oil sample was being reported for the first time and represents another chemotype of the oil of H. officinalis

Viburnum tinus L. investigation on its spontaneous emission at duifferent fenological stages

The volatile components emitted from different organs of Viburnum tinus L., collected during various develop- mental stages, were analysed by solid phase micro extraction (SPME) and identified by GC-MS. More than 90% of the identified fraction was represented by non-terpenes in both young and adult leaves (94.2% and 94.3%, respectively), as well as in fruits of different ages: unripe and ripe (red and black) (93.1%, 90.6% and 90.9%, respectively). This latter class was also the predominant one in Viburnum crushed fruits (pericarp and seeds), even though with low amount (67.0%). (Z)-3-hexanol acetate was the main compound in all the leaf samples and red fruits, while apiol (40.9%) was the most abundant in unripe fruits and (E)-2-hexen-1-ol (52.8%) in black ripe fruits. On the contrary, the crushed fruits were characterized by decanal (12.0%) and n-hexanol (8.2%). Bud and flower emissions highlighted a good percentage of oxygenated monoterpenes (80.0% and 75.0%, respectively) mainly represented by (E)-β-ocimene (76.5% and 72.1%, respectively). The stem composition was characterized by non-terpenes (34.6%) followed by sesquiterpene hydrocarbons (29.0%) and oxygenated monoterpenes (17.6%)

Evolution of volatile emission in Rhus coriaria organs during different stages of growth and evaluation of the essential oil composition

Rhus coriaria, also known as Sumac, has been traditionally used in many countries as spice, condiment, dying agent, and medicinal herb. The chemical composition of essential oils (EOs) and the volatile emissions from different organs of this species collected in Sicily (Italy) were analyzed by gas chromatography-flame ionization detection and gas chromatography/mass spectrometry. Monoterpene and sesquiterpene hydrocarbons were the most abundant class in the volatile emissions with β-caryophyllene and α-pinene were the main constituents in the majority of the examined samples. The EO composition was characterized by high amount of monoterpene and sesquiterpene hydrocarbons together with diterpenes. The main compounds in the EO obtained from the leaves and both stages of fruit maturation were cembrene and β-caryophyllene, while α-pinene and tridecanoic acid were the key compounds in the flower EO. All the data were submitted to multivariate statistical analysis showing many differences among the different plant parts and their ontogenetic stages

Composition of the essential oils in various organs at different developmental stages of Ammi visnaga (L.) Lam. from Tunisia

The composition of the essential oils isolated by hydrodistillation from various organs at different development stages of Ammi visnaga (L.) Lam. growing in Tunisia was determined by GC/MS analysis. In particular, the oil profiles of the leaves, stems, flower buds, roots, umbels, and fruits have been examined during the whole life cycle. The oil from the flowering aerial parts was characterized by a high content of isoamyl 2-methylbutanoate. After flowering and during desiccation and fructification, the umbels and fruits expressed a high content of linalool. The oils, extracted from the roots collected in the vegetative, buds floral, and floral stages, were rich in monoterpene aldehydes, oxygenated monoterpenes, and monoterpene hydrocarbons. The highest level of non-terpene hydrocarbons was found at the flowerbud stage, represented by 61.3% of nonane. Among the monoterpenes, sabinene (12.5%) and β-pinene (8.5%) were identified in the flower buds

Larvicidal and repellent activity of the essential oil of Coriandrum sativum (Apiaceae) fruits against the filariasis vector Aedes albopictus Skuse (Diptera: Culicidae)

The essential oils of many Apiaceae species have been already studied for their insecticidal and repellent properties against insect pests. In this research, the essential oil (EO) extracted from the fruits of Coriandrum sativum L. (Apiaceae) was evaluated for the first time for its larvicidal and repellent activities against the most invasive mosquito worldwide, Aedes albopictus Skuse (Diptera: Culicidae). The chemical composition of C. sativum EO was investigated by gas chromatography with electron impact mass spectrometry analysis. Coriander EO was mainly composed by monoterpene hydrocarbons and oxygenated monoterpenes, with linalool (83.6 %) as the major constituent. C. sativum EO exerted toxic activity against A. albopictus larvae: LC50 was 421 ppm, while LC90 was 531.7 ppm. Repellence trials highlighted that C. sativum EO was a good repellent against A. albopictus, also at lower dosages: RD50 was 0.0001565 μL/cm2 of skin, while RD90 was 0.002004 μL/cm2. At the highest dosage (0.2 μL/cm2 of skin), the protection time achieved with C. sativum essential oil was higher than 60 min. This study adds knowledge about the chemical composition of C. sativum EO as well as to the larvicidal and repellent activity exerted by this EO against A. albopictus. On this basis, we believe that our findings could be useful for the development of new and safer products against the Asian tiger mosquit

Comparison between virgin olive oil and flavoured olive oil in terms of quality parameters, volatile compounds, and consumer preference

Analytical parameters, fatty acid composition, total phenols, pigments, volatiles compounds and hedonic characteristics were studied for unflavoured (EVOO) and flavoured (FOO) Chemlali olive oils. FOO were prepared by addition of commercial aromatic preparation of herbs, basil, thyme, rosemary and pizza, to Chemlali olive oil. The hedonic study was conducted to assess Tunisian consumers’ appreciation degree of FOO. The addition of commercial aromatic preparations caused an increase in the concentration of phenols only in two-FOO, the thyme and pizza-flavoured ones. The K270 value of FOO oil was higher than K270 value in EVOO. However, no modification on acidity, peroxide value, and K232 and in the oxidative stability was detected. As expected, the addition of aromatic solutions led to a remarkable modification in the aromatic composition of the olive oil. These changes appeared to be responsible for the large variability of consumers’ preference towards EVOO and FOO. However, it became clear that consumers preferred the FOO

Essential oil content of the flowers of Pituranthos scoparius in Algeria

The essential oils obtained by hydrodistillation of the flowers of the Algerian Pituranthos scoparius (Coss. & Dur.)Benth.et Hook. (Apiaceae), an endemic species of North Africa, were analyzed by GC-MS. Thirty-one compounds were identified accounting for 99.3 % of the whole essential oil, mainly represented by monoterpenes, followed by phenylpropanoid derivatives. The main constituents of the essential oil were myristicin (24.1%), α-pinene (17.4%), α-phellandrene (15.6%) and sabinene (7.5%

Evaluation of volatile constituents of Cochlospermum angolense

The chemical composition of the essential oils obtained from the leaves and roots of Cochlospermum angolense (Welw) growing wild in Angola was analyzed for the first time by capillary gas chromatography (GC) and gas chromatography/mass spectrometry (GC-MS). The investigation led to the identification of 67 and 130 compounds from the leaves and roots, respectively. Both oils were strongly characterized by the presence of sesquiterpenoids (68.8% in the leaves and 53.2% in the roots), while monoterpenoids were present in minor percentages (9.8% in the leaves and 26.2% in the root). The main constituents of the leaves were germacrene D (9.4%), a-cadinol (7.4%) and 10-epi-cubenol (6.2%), while the most abundant compounds in the root essential oil were the sesquiterpenes ß-caryophyllene (19.7%) and isoborneol (6.6%). The analysis by HS-SPME of the roots, leaves, fruits and seeds were also reported for the first time. Different volatile profiles were detected